Electronic sleep monitor headgear
Patent 4836219 Issued on June 6, 1989. Estimated Expiration Date: 
July 8, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 8, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3363242 3658054 Self contained head mountable sleep inhibiting device Eyelid movement detector Patent #: 4359724 InventorsAssigneeApplicationNo. 07/070988 filed on 07/08/1987US Classes:600/595, Body movement (e.g., head or hand tremor, motility of limb, etc.)340/575, Sleep340/576Drive capabilityExaminersPrimary: Howell, Kyle L.Assistant: Sykes, Angela D. International ClassA61B 5/11 (20060101)AbstractElectronic filters are applied to analog signals representative of eye movement and head movement, obtained from detectors attached to a simple headgear, to provide satisfactory information for automatically reporting an individual's sleep state. The filters determine whether there has been substantial eye and head movement in a given period. Each filter then generates binary output signals representing movement (or the absence of it). Noise filters and a comparison filter are then applied to the binary output signals to predict sleep state; REM sleep; NREM sleep; or wakefulness.Other References
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